On its most fundamental level, film editing is the art, technique, and practice of assembling shots into a coherent whole. A film editor is a person who practices film editing by assembling the footage. However, the job of an editor isn’t simply to mechanically put pieces of a film together, cut off film slates, or edit dialogue scenes. A film editor must creatively work with the layers of images, story, dialogue, music, pacing, as well as the actors' performances to effectively "redirect" and even rewrite the film to craft a cohesive whole. Editors usually play a dynamic role in the making of a film.